70% = Notional reflectance assumed where it is known that the reflectance factor is greater than 50%
83% = Actual reflectance of Magnolia colored paint in matt (Dulux®) Floor 20% = Typical industry floor reflectance
10% = Notional reflectance of a floor based on assumption that floor finishes are very dark
30% = Actual reflectance of a light colored carpet
RCR=1.7 Coefficient of Utilization (CU)= .57
*2X4 light florescent light fixture composed of 4 lamps that release 1800 lumens
footcandles for a dinning area falls around 20 for restaurant FC=20
illuminance E= (lamp lumens x CU)/area =8412(.57)/4206 = illuminance E= 1.14
E=(lamp lumens x CU x LLF)/area = 4206=[8412(.57)LLF]/4206 = LLF=1.75
Applying Findings:
The spreadsheet shows the cavity ratio for the ceiling,room and floor as well as their effective reflectance. The number of fixtures needed to illuminate the space to get a a require 20 footcandles for the entire space to be illuminate evenly. The 4206 sq.ft area will take 12 fixtures approximately 19 feet off center to obtain the 20 footcandles for the entire space.
Showing the task lighting for a dinning table at the restaurant. The Ray of light is 9.5ft in distance and the light fixtures emitting 1800cd illuminates 20 footcandles.
Showing the task lighting for a 3'6" food pick up counter with the light fixture directly above the counter therefore the beam angle and incidence angle is 0. The illumination of the fixture uses 25 footcandles.
Interior Lighting Strategies:
Interior Restaurant, 3rd floorRoom Cavity Ratio (RCR)=1.7
Floor Cavity Ratio (FCR)=.54
Ceiling Cavity Ratio (CCR)=.36
Ceiling
70% = Typical lighting industry ceiling reflectance
80% = Notional reflectance assumed where it is known that the reflectance factor is greater than 70%
86% = RAL 9010 20% gloss ceiling
Wall
50% = Typical lighting industry wall reflectance
70% = Notional reflectance assumed where it is known that the reflectance factor is greater than 50%
83% = Actual reflectance of Magnolia colored paint in matt (Dulux®)
Floor
20% = Typical industry floor reflectance
10% = Notional reflectance of a floor based on assumption that floor finishes are very dark
30% = Actual reflectance of a light colored carpet
RCR=1.7 Coefficient of Utilization (CU)= .57
*2X4 light florescent light fixture composed of 4 lamps that release 1800 lumens
footcandles for a dinning area falls around 20 for restaurant FC=20
illuminance E= (lamp lumens x CU)/area =8412(.57)/4206 = illuminance E= 1.14
E=(lamp lumens x CU x LLF)/area = 4206=[8412(.57)LLF]/4206 = LLF=1.75
Applying Findings:
The spreadsheet shows the cavity ratio for the ceiling,room and floor as well as their effective reflectance. The number of fixtures needed to illuminate the space to get a a require 20 footcandles for the entire space to be illuminate evenly. The 4206 sq.ft area will take 12 fixtures approximately 19 feet off center to obtain the 20 footcandles for the entire space.
Showing the task lighting for a dinning table at the restaurant. The Ray of light is 9.5ft in distance and the light fixtures emitting 1800cd illuminates 20 footcandles.
Showing the task lighting for a 3'6" food pick up counter with the light fixture directly above the counter therefore the beam angle and incidence angle is 0. The illumination of the fixture uses 25 footcandles.
Reflected Ceiling Plans